Abstract: Some germination inhibiting substances in the endangered herb Ferula fukanensis seeds were studied so as to find the factors affecting seed dormancy based on the following methods: ① Water treatment with germination test; ② Bioassay of water and NaHCO₃ leaching liquor; ③ Observation of the effect of Ferula fukanensis seeds on the pH values of the extracting media of distilled water and NaHCO₃. The results show that the germination percentages of seeds immersed in water for 5 and 20 days were as high as 77% and 85% respectively, and they were significantly higher than 47% of the contrast seeds (P<0.01). The inhibitory effect of NaHCO₃ extract on the germination of wheat seeds was significantly higher than that of H₂O (P<0.05). The pH values of the distilled water and NaHCO₃ extracts converged in a range of 8.0～8.3 after the Ferula seeds were immersed. The inhibitory effect of alkaloid extract on the germination of wheat seeds was significant, and the inhibition rate could be as high as 80% at a concentration level of 10 g·（100L）^-1. It could be concluded that the effect of alkaloid on the regulation of seed dormancy of Ferula fukanensis was very important except abscisic acid.

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